Polyphenol oxidase - Wikipedia
Polyphenol oxidase (PPO; also polyphenol oxidase i, chloroplastic), an enzyme involved in fruit browning, is a tetramer that contains four atoms of copper per molecule. [1] PPO may accept monophenols and/or o-diphenols as substrates. [2]
Polyphenol Oxidase - an overview | ScienceDirect Topics
Polyphenol oxidase (PPO) is a copper containing enzyme widely occurred in many plants, animals, bacteria and some fungi. Polyphenol oxidase has wide applications in the field of biosensor formation, food industry, medicine and waste water treatment.
Polyphenol Oxidases in Crops: Biochemical, Physiological and …
Polyphenol oxidases (PPOs) are a group of Cu-containing enzymes that catalyse the oxidation of several phenols to o -quinones [,]. In turn, o -quinones are highly reactive molecules that can undergo non-enzymatic secondary reactions to form brown complex polymers known as melanins and cross-linked polymers with protein functional groups [,,,].
Polyphenol oxidase in leaves: is there any significance to the ...
Polyphenol oxidase (PPO) catalyses the oxidation of monophenols and/or o-diphenols to o-quinones with the concomitant reduction of oxygen to water which results in protein complexing and the formation of brown melanin pigments.
Novel Roles for the Polyphenol Oxidase Enzyme in Secondary …
The polyphenol oxidase enzyme functions in the metabolism of the amino acid tyrosine in walnut. Abstract. The enzyme polyphenol oxidase (PPO) catalyzes the oxidation of phenolic compounds into highly reactive quinones.
Recent advances in polyphenol oxidase-mediated plant stress responses
2021年1月1日 · A review of the molecular and biochemical aspects of polyphenol oxidase (PPO) gene family, expression regulation and defence function in plants. Learn how PPOs catalyse the oxidation of phenols and respond to abiotic and biotic stresses, especially herbivores and pathogens.
Frontiers | Beyond brown: polyphenol oxidases as enzymes of …
2015年1月13日 · Polyphenol oxidases (PPOs) are copper containing enzymes that have catechol oxidase and tyrosinase activities. They are involved in browning, defense, and betalain biosynthesis in plants.
Recent Advances of Polyphenol Oxidases in Plants - MDPI
2023年2月25日 · This article summarizes the latest research on polyphenol oxidase (PPO) in plants, including its distribution, structure, activity, regulation, and functions. It also discusses the methods to inhibit PPO activity and the future research directions of PPO in plants.
Polyphenol Oxidase - SpringerLink
A review of polyphenol oxidase (PPO) structure, function and regulation in plants and food processing. Learn about PPO catalytic activity, substrate specificity, quinone formation, and genetic engineering of PPO expression.
Enzymatic browning: The role of substrates in polyphenol oxidase ...
Enzymatic browning is a biological process that can have significant consequences for fresh produce, such as quality reduction in fruit and vegetables. It is primarily initiated by polyphenol oxidase (PPO) (EC 1.14.18.1 and EC 1.10.3.1) which …